susie started a lemonade stand advertising 2 dollars per cup of lemonade, wendy also decides to open up a lemonade stand across from susie charging only one dollar per cup. this is an example of

Decreases and the equilibrium quantity increases

Explanation:

If more children join Susie in the lemonade business, the supply of lemonade would increase. This is indicated by a rightward shift of the supply curve. Because supply has increased relative to demand , price would fall and equilibrium quantity would increase.

I hope my answer helps you

d is the logical answer but im not a 100% sure